Mixing-machine.



N. M. ROSENDAHL.

MIXING MACHINE. APPLICATION FILED AUG.28. 19H.

N. M. ROSENDAHL.

MIXING MACHINE.

APPLICATION FILED AUG.28. 1911.

3 SHEETS-SHEET 2.

1 N *0 fig I v St N. M. ROSENDAHL.

MIXING MACHINE.

APPLICATION FILED AUG-28, 19H.

1, 172,559. Patented Feb. 22,1916.

3 SHEETS-SHEET 3- NILS M. ROSENDAHL, OF CHICAGO, ILLINOIS, ASSIGNOR TO FREDERICK c. AUSTIN, or

CHICAGO, ILLINOIS.

MIXING-MACHINE.

To all whom it may concern:

Be it known that I, N1Ls M. ROSENDAHL, a citizen of the United States ofAmerica, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Mixing-Machines, of which the following is a specification.

My invention relates to mixing machinery of the kind employed in making mixtures Ior paving and uilding purposes. F or example, a common type of machine for this purpose consists of a rotary receptacle which'is cubical in form, and which is disposed in position to rotate about an axis coincident with two diametrically opposed corners thereof, whereby the contents are tossed about and agitated in the manner necessary "to effect the desired mixture there- 7 of. A machine of this kind, however, is

ordinarily only adapted and employed for mixing concrete and similar materials.

The object of my invention, broadly stated, is to provide an improved machine for mixing asphaltum or other similar mixtures requiring the application of heat.

A special object of my invention is to provide an improved construction and arrangement whereby a concrete mixer, having the aforedescribed cube-shaped receptacle, may be employed for heating and mixing asphaltum and other similar preparations for paving purposes.

To the foregoing and other useful ends, my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings Figure 1 is a front elevation of a mixing machine embodying the principle of my invention. Fig. 2 is a side elevation of the machine shown in Fig. 1. Fig. 3 is an enlarged sectional view of the combined hopper and heater for feeding the asphalt and other materials into the cube-shaped receptacle of the said mixer, and for also forcing heated gases into the said receptacle, whereby the asphalt and other materials heated preparatory to and during the making thereof. 'Fig. 4 is a section on line 3-3 in Fig. 3.

As thus illustrated, my invention comprises a body frame A of any suitable or desired construction. Upon this body frame the cube-shaped receptacle B is mounted for rotation in any suitable or well known manner. As shown, the said receptacle is pro- Specification of Letters Patent.

Application filed August 28, 1911.

potrequire further explanation.

are properly Patented Feb. 22, 1916. Serial No. 646,378.

vided with the usual gear'ring b which is engaged by a pinion b on the shaft 6 WhlCh latter is driven in any suitable manner. The said body frame is swingingly supported on the upright brackets or bearlngs a, 1n the usual and well known manner, whereby the receptacle may be tilted to discharge the mixture. With this construction, the receptacle is preferably provided with a hopper C by which the materials are fed to the receiving end of the receptacle, and with a spout or discharge nozzle D at the other side thereof, whereby the materials are received by the receptacle and discharged therefrom at the axis thereof. The hopper C is supported by a frame 0 upon the body frame A in any suitable manner.

mixing machine of this general character is well known and well understood, and does In order that a machine of this character may be employed for making asphaltic or other similar mixtures, req .iring the appllcatlon of heat, thehopper C is provided on the underside thereof with a combustion chamber E which is lined with fire clay or other refractory material e, and which is provided with a spout or nozzle 6 by which the hot gases are discharged into the rotary receptacle B to properly heat the contents thereof. The heated gases are produced by a gas burner F inserted in one side of the combustion chamber and provided with the usual air mixing device f, flame is maintained in the combustion chamber. The air nozzle G is inserted through the front wall of the combustion chamber, and by this arrangement the heat and hot products of combustion are forced out of. the spout or nozzle e and into the rotary receptacle. It will be seen that the gas burner F is so arranged that the force of the gas or flame produced thereby is exerted in a direction tangential to the axis of the circular combustion chamber, whereby a whirling or cyclonic motion of the heat and hot gases is produced, thus rendering the injection of the same into the receptacle by the force of the air jet more effectual. When the heat and hot gases enter; the receptacle, the asphalt or other similar materials therein are then heated and softened or melted in the desired manner, and the rotation of the cube-shaped receptacle causes an effective and satisfactory mixture whereby a hot of the materials. Vithout the heat, of course, a machine of this character would not be capable of effectively mixing asphaltic or other similar substances with other materials, and could not be used for this purpose. Moreover, the heat not only acts on the contents of the-receptacle, but. also serves to keep the hopper C in a heated condition, whereby the materials are, if necessary, heated and somewhat reduced in character before being allowed to enter the receptacle.

Any suitable arrangement can be employed for feeding the gas and air to the heating device on the hopper. For example, a tank H can be provided internally with compartments for gas and air, and connected by pipes h and h with the burner and air jet. The burner can be provided with a controlling valve f, and the air nozzle or jet can be provided with a similar valve 6', whereby the gas and air can be controlled at will. It will be understood, however, that various arrangements can be employed for supplying and controlling the gas and air, and that various changes can be made in the construction without departing from the spirit of my invention.

\Vhen the materials are thoroughly heated and mixed, the body frame A is tilted in the usual and well known manner, whereby the contents of the cube-shaped receptacle are discharged through the axial spout or nozzle D, it being understood that the receptacle and frame A are adapted to tilt about the horizontal axis provided by the bearings a, as will be readily understood by those familiar with concrete mixers of this general character. By combining a heating device with the rotary receptacle, a machine of this kind becomes suitable for use in mixing asphalt or other similar ma terials which are required to be melted or softened before they can be satisfactorily treated. and before they can be combined with other materials, such as crushed rock or gravel. A machine characterized by my invention is, therefore, more especially adapted for use in putting down certain Well known kinds of paving From the construction shown and described, it will be seen that the heat and products of combustion are blown into the receptacle, and are thereby brought into direct contact with the materials contained therein. Thus the asphalt and other similar materials are heated and properly reduced and all products of combustion or gases resulting th refrom are forced across the machine and out through the spout or nozzle D in a manner that will be readily understood. Theblast of heat and hot gases coming from.the nozzle 6 passes'directl'v across the interior of the machine, and through the materials, as they are tossed about and agitated, thus producing thefd6- sired effect.

I do not limit myself to the exact construction shown and described.

What I claim as my invention is: 1. A mixing machine comprising a frame, a rotary receptacle having inlet and outlet trunnion bearings on said frame. pivots for tilting said frame into position to discharge the contents of said receptacle from said outlet, means having an axis coincident with one of said pivots to rotate said receptacle, apparatus supported on said tilting frame to supply heat through said inlet, and means for feeding the materials to said inlet.

2. A mixing machine comprising a frame, a rotary receptacle having inlet and outlet trunnion bearings on said frame, pivots for tilting said frame into position to discharge the contents of said receptacle from said outlet, means having an axis coincident with one of said pivots to rotate said receptacle, apparatus supported on said tilting frame to supply heat through said inlet, and means for feeding the materials to said inlet, said apparatus comprising a burner, a combustion chamber for said burner. opening directly into said inlet, and flexible connections for supplying fuel to said burner.

3. A mixing machine comprising a frame, a rotary receptacle having inlet and outlet trunnion hearings on said frame, pivots for tilting said frame into position to discharge the contents of saiu receptacle from said inlet, means having an axis coincident with one of said pivots to rotate said receptacle, apparatus supported on said tilting frame to supply heat through said inlet, means for feeding the materials to said inlet, and means for supplying fluid under pressure to blow the heat directly into said inlet.

4. A mixing machine comprising a frame,

a rotary receptacle having inlet and outlet trunnion bearings on said frame, pivots for tilting said frame into position to discharge the contents of said receptacle from said outlet, means having an axis coincident with one of said pivots to rotate said receptacle, apparatus supported on said tilting frame to supply heat through said inlet, and means for feeding the materials to said inlet, said apparatus comprising a burner, a combustion chamber for said burner, opening directly into said inlet, flexible connections for supplying fuel to said burner, and means for supplying fluid under pressure to blow the heat directly into said inlet.

5. A mixing machine comprising a rotary receptacle having axial inlet and outlet openings, means for rotating said receptacle, a combustion chamber communicating directly with said inlet, a burner in said chamber, means immediately above said burner for feeding the materials to said in let, and means for supplying fluid under pressure to blow the heat directly into said inlet. 1

6. A mixing machine comprising a frame, a rotary receptacle having mlet and outlet trunnion hearings on said frame, pivots for tilting said frame into position to discharge the contents of said receptacle from said outlet, means having an axis coincident with one of said pivots to rotate said receptacle, apparatus including a burner supported on said tilting frame to sup ly heat through said inlet, and means for eeding'thematerails to said inlet, said burner being in position to direct the flame in a spira the axis of which extends toward said inlet, and means for blowing air through the spiral to force the heat into said receptacle.

7. A mixing machine comprising a rotary receptacle having axlal inlet and outlet openings, means for rotating said receptacle,

a combustion chamber communicating diing air through the spiral to force the heat into said receptacle.

Signed b meat Chicago, Illinois, this 22nd day 0 August 1911.

NILS M. ROSENDAHL. Witnesses:

E. MILLER, Gno. SCHMIDT. 

